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SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (ZM)] 01–03A–37 01–03A NO.15 EMISSION COMPLIANCE [ZM] A3U010318881W57 Diagnostic procedure 15 Emission compliance DESCRIPTION • Emission compliance test failed. POSSIBLE CAUSE • Vacuum lines leakage or blockage • Cooling system malfunction • Spark plug malfunction • Leakage from intake manifold • Erratic or no signal from CMP sensor • Inadequate fuel pressure • PCV valve malfunction or incorrect valve installation • EGR valve malfunction • Exhaust system clogging • Fuel tank ventilation system malfunction • Charcoal canister damage • Excessive carbon is built up in combustion chamber. • Improper engine compression • Improper valve timing Warning •••• Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep •••• Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or STEP INSPECTION ACTION 1 • Inspect for following: concerns: obstructions, leakage or • Are all items okay? Yes Go to next step. No Service as necessary. 2 • Connect WDS or equivalent to DLC-2. • Turn ignition switch on. • Retrieve any DTC. • Is “DTC” displayed? Yes DTC is displayed: • Go to next step. No No DTC is displayed: • Go to appropriate DTC test. 3 • Is any other drivability concern present? Yes Go to appropriate symptom troubleshooting. No Go to next step. 4 • Connect WDS or equivalent to DLC-2. • Access ECT PID. • Warm up engine and run it at idle. • Verify ECT PID is correct. • Is ECT PID correct? Yes Go to next step. No Inspect for coolant leakage, cooling fan and condenser fan 5 • Is strong blue spark visible at each Yes Inspect for following: • Spark plugs malfunction • CMP sensor is improperly installed. • Damage of trigger wheel on camshaft • Open or short circuit on CMP sensor • Open or short circuit between CMP sensor and PCM Repair or replace malfunctioning parts. • If okay, go to next step. No Inspect following: • High-tension leads • Ignition coil and connector 1712-1U-01G(01-03A).fm 37 ページ 2001年6月29日 金曜日 午後4時45分 |